The cars jumped the tracks between the /*Brooklyn Bridge*/-/*City Hall*/ and Canal Street stations just before 4:30 a.m.
None of the 19 passengers on board the train were injured.
A rescue train was sent to get the passengers out of the subway tunnel.
The cause of the derailment is under investigation.
Number 4, 5 and 6 train service was subject to extensive disruption as authorities worked to repair the damage.
Train service resumed shortly before noon, but delays continued into the afternoon.
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